you go to fushia city to battle koga and claim your marsh badge
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go into sliph co go into the telaporters find Gary beat him
safron city
You use the first teleporter then u go top left, top right, bottom left, top right, then lastly you go on the bottom right and then the gym leaderwith defeat you if you are bad at pokemon. That is how you get to the safron gym leader.
You need to first clear the Team Rocket Hideout in Celadon city.
you gotta go spelunking around for it (looking around for it) in the silph co building.